(PECL gmagick >= Unknown)
Gmagick::setfilename — Sets the filename before you read or write the image
public Gmagick::setfilename ( string $filename ) : Gmagick
Sets the filename before you read or write an image file.
filename
The image filename.
The Gmagick object on success
Throws an GmagickException on error.
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https://www.php.net/manual/en/gmagick.setfilename.php